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space invaders (Read 1564 times)
jimbob
space invaders
Aug 26th, 2008, 7:12am  
hey im having trouble creating a space invaders type program. where the bullet is shot from the mouse when it is pressd at amoving boxes down the bottom
this is my code so far to create the bullet but cant get it to work
any tips would be great
int y = 0;
int i = 0;
shoot [] history;
void setup() {
 size(500, 500);
 background(255);
 history = new shoot[100];
 if(mousePressed){
      i=i+1;
history[i] = new shoot(mouseX,mouseY);
 
   
}
}

void draw()
{
 for(int k = 0;k<100;k++){
   history[i].update();
   history[i].draw();

 }
}
 
   

  void mouseReleased(){
    history[i].update();
   
 }

 class shoot{
   int x = 0;
   int y = 0;
   shoot(int X,int Y){
   x = X;
   y= Y;
   
   }
 
 publi void update (){
    y = y+10;
    stroke(30,30,0);
  }
    void draw(){
      line(x,y,x,y+10);
    }

}
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PhiLho 
Re: space invaders
Reply #1 - Aug 26th, 2008, 8:32am  
Quick fix:
Code:
 int i = 0;
 int MAX = 100;
shoot [] history;
void setup() {
  size(500, 500);
  background(255);
  history = new shoot[MAX];
}
 
void draw()
{
  background(55, 120, 178);
  for(int k = 0;k<i-1;k++){
    history[k].update();
    history[k].draw();
 
  }
  if(mousePressed && i < MAX){
 history[i++] = new shoot(mouseX,mouseY);
}
}
   
     
 
  class shoot{
    int x = 0;
    int y = 0;
    shoot(int X,int Y){
    x = X;
    y= Y;
     
    }
   
  public void update (){
     y = y+10;
   }
     void draw(){
     stroke(30,30,0);
  line(x,y,x,y+10);
     }
 
}

No dynamic code in setup, it is called only once.
Removed the mouseReleased callback, I don't see its purpose.
Have put a limit on i. You should find another way since you will exhaust quickly the array. No time to code that now. Limited k to latest i, to avoid using a null object.
Moved the stroke() to draw(). Added a background() call to avoid the tracing on screen.
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WWW  
jimbob
Re: space invaders
Reply #2 - Aug 26th, 2008, 2:34pm  
thanks heaps man, tonnes of help
also i was wondering if anyone had any tips for making the bullet react and hit a box if it collids
cheers jamie
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